12055-br720p-subs-westsidestory.mp4 -

Likely an internal tracker number or MPAA production code (e.g., Hit Parade of 1947 uses this MPAA number ). Source Material

Short for , indicating the high-definition physical disc source. 720p Resolution 12055-BR720p-SUBS-WESTSIDESTORY.mp4

West Side Story 4K Blu-ray (4K Ultra HD + Blu-ray + Digital) Likely an internal tracker number or MPAA production code (e